[R] apply fun to df returning a matrix

[Mohamed Lajnef]

Hi Soeren

Apply or aggregate functions

best regards
M
Soeren.Vogel at eawag.ch a écrit :
> Hello, a data.frame, df, holds the numerics, x, y, and z. A function, 
> fun, should return some arbitrary statistics about the arguments, e.g. 
> the sum or anything else. What I want to do is to apply this function 
> to every pair of variables in df, and the return should be a matrix as 
> found with cov. How can I achieve that? Thanks, Sören
>
> df <- data.frame(x=1:10, y=11:20, z=21:30);
> fun <- function(x){
>   return(sum(x));
> }
> # and now???
>
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